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professors emeritus
Youngjune Moon
Name
Youngjune Moon | Professor
Tel
+82-2-3290-3358
Fax
+82-2-926-9290
E-mail
yjmoon@korea.ac.kr
address
411, School of Mechanical Engineering, Korea University, Anamdong, 5-Ga, Sungbuk-Gu, Seoul, Korea, 136-713
Education
May 1982 B.S of Mechanical Engineering, State University of New York, Buffalo, USA
June 1984 M.S of Mechanical Engineering, Stanford University, USA
Dec. 1988 Ph.D of Mechanical Engineering, University of California, Berkeley, USA
Lab.
Computational Fluid Dynamics and Acoustic Lab.
Turbomahcinery noise
Turbomachinery noise is primarily associated with blade-to-blade interactions. As a collaboration research, a test bench at the Ecole Centrale de Lyon is computationally investigated by large-eddy simulation (LES) and the linearized perturbed compressible equations (LPCE). The computed flow and acoustic fields clearly show the dipole noise generated at the leading-edge of NACA0012 airfoil via periodic rod wake-blade interactions.
Airfoil trailing-edge noise
Airfoil trailing-edge noise continues to be an important noise issue for aircrafts during take-off and landing. The spectral profile is broadband, associated with three-dimensional, spatio-temporal interactions of boundary layer eddies with the cut-off edge and often superimposed with a tonal peak, attributed by vortex shedding due to edge-bluntness. A benchmark test bench at the Ecole Centrale de Lyon is computationally investigated by LES/LPCE hybrid method. The computed flow and acoustic fields clearly show the dipole noise generated at the tailing-edge of the flat plate via scattering of turbulent eddies in the boundary layer.
Noise reduction via porous media
Airfoil trailing-edge noise can be substantially reduced by implementing a porous surface at the trailing-edge of the flat plate and thus weakening the edge-scattering effects. The pressure fluctuation near the trailing-edge computed by LES/LPCE clearly indicates the breaking of its coherences in both streamwise and spanwise directions. The SPL spectrum shows that a tonal peak is reduced by 15dB.
Fan noise
Recently, fan noise is an important noise issue for automobiles with hybrid engines. A collaboration research is being conducted with the Ecole Nationale Superieure d’Arts et Metiers, Paris to develop a low-noise fan blade impellers. An experimental test bench is set-up at ENSAM, while computations with computational modeling of entire fans are being carried out at CFD/A lab.